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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d7749430c7cd34ba0106ba504ad35642ed2f66429036d296693364c24639fd' 
  AND token = '7xonXozUiyXC0JGgqScp4ogiDG194BHdFF7NyRVA9yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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