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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e1710b2123d0e11c0cb030b106ec99b9dd8a91eabc9ae4f987dfb43cd5f33c6' 
  AND token = 'J1jj2X1IXD1XGvJJEQ+4YFDof8pYiT1SbT4JruEwU0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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