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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf20d6caa026d858b06e6f1568ead46178eee5a0c48ecd362aece642f398e178' 
  AND token = 'YGRnQp0XXAitOXdmUSbA7mMrmDj71pfcouByICVi/mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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