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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64ae2b7b0ddef635ddbb4fda0c7755e4cc15a4ac46a53701450adc0bda0a64c7' 
  AND token = 'FbwikWpXpA10CyoNyCvEcc3Xsgrw2t7OG654Yd63sL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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