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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af30f108e1f0d3a1bf0c1b6916ad0093fbd90fa2eb2cd8c4d556a1fdfefefdf4' 
  AND token = 'rVy9RJIuT3CE3kREZEPavHcVibUnrDzqOuTlmmfsBsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00115

JSON explain

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