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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f009c95bc9b48e41f72432e00f2f5ce0bffb5f8c7449286d91d20d150fea2c53' 
  AND token = 'UzoUph4wXd25sTna1eYGHArzF6xwYdLJF++T5QumS2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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