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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75b37ca0e383284190948ad0200580df8625787b3de38906e7d0b46079dbb064' 
  AND token = 'Hjp59WqUnoSNLk/+TSd1rrs8o64glYSPXW6DiFTW0ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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