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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca6cb6396203be584ef6d42ef553bf65c5da701c6cb89b8346fe1b697bff656' 
  AND token = 'aPt+OKSApbcgtresaSP4CmuAkUejJwhf4SHVArEWyvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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