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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cb74ecdeb5d6bd235f58b95d393dd77e5d4663d9cbac0995458a26e1ab0c7ad' 
  AND token = 'oB6HeBVCMGgMJkbrsks3XvY+Kb0ko9IM74ffjk/nBsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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