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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '174d86b5ac77981a857f912916eef3c9c226d87fde440d29d94ffc13d8bc90ac' 
  AND token = 'hdNjZGbTNva+YBccl8M0DooB/1v3bjMqrRwtmjluIH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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