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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5fe0423f477095bebedb018408796c50fb8aec01f36822c3723e7c4947851fb' 
  AND token = 'Nh9n19qL1VblZdeJ1uh6yrI8OL5rCmFDu2obAVwgWgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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