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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61ffffa8eba0f81686109850637f05322a8d786d756ac56bb03f5cb4281e479d' 
  AND token = 'Ha7qJEDjdaPJplK42mx1XtRAimLXBZ20jZGaJj0QsU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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