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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '440b5558f57a5fc58ac41aa8b234635834d989706e4c5e032e4d23dc00693773' 
  AND token = 'SXI1r1wzGPQTFOzhNugRb+3ji4uo65Qty2jIIAEAHMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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