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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d6f54755c82600cd7e72d91e01cb589a753989d7e202f8fccd0c59bab31e2b' 
  AND token = 'h76pcNf59DCfkn78lXzm7L0paBXlPGkh5xXAsII5kBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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