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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91c76defcd19f235c9709f93e653088a84c395b0e397e695c260d2124efe00f9' 
  AND token = 'tRqgm8htV58Ho5Kp93BfyWQYvLDoxTgCw4ORh3eiECY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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