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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c3e17eb4543d9e6b5fe2bf04406fd43e681f52fb94a4038ec0674b934334c7' 
  AND token = 'ZQrCrr/db2PHm8x8ISzMmdODRhmOtqERF8rII/sZH4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}