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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eccff986a56b7f16ff5006c467cdf705586588ce1097d8e790d95dbeadc68f05' 
  AND token = 'P6i53Xhdmve0lDjemFpp30t/ocJ+GdLntiP+Hgo1D8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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