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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaee8d856b2da80b02f75bd84c338999bc1d2e6f6adbea696f14fa5a58edc531' 
  AND token = 'S0Rwdky+2ezzLuahcRDipqLdDZWsPQVIlifTuqvu0b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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