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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5ba48c997193a88955cda8856662a3de5020c24ef2e70ffff4a3bca907d22c1' 
  AND token = 'OjU5+YN4uc05qKYQbaWqI92NpuBQJU0Wc+pQgx6glag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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