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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87e51c2635b57f36ca5a40e2023674bf80a1e60cd1b61d5f3aa3b2f7b14a37b6' 
  AND token = 'jFCid7pTiPjmsJQYQV/5ypeOUu1s5lUO57JJPE4fHI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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