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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57f0adb24690fb2446bc88aa4812810f9b26ffb00ae0138001e2efac5d29a404' 
  AND token = '3qvBZQsu5JnJyib0syYRp+ZYPqVrEoyfXP4kCyeJC+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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