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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f806c719ab62097719716634b784e7f438235134c564b8c1d22817a9c2900c05' 
  AND token = 'rPf3cJg8n/Sx9tbMBvdEVH1wv6qhbDtErlXLQrL50R4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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