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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a16998a28b6975183d905d4b6aba706b9f873c9ddddef20da2498eb4911e3e' 
  AND token = 'I7F8zIueFvK3itQTYL3VF+kSCA2yCbkCaKIVYOkXp4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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