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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f392abfe3be47a30655898077f1bc5d09a0ee9036d0f6b800593e4a78c5cc438' 
  AND token = 'xCUtWxt6FDrRrqAVyZ5Ns+vuMkSBk+T+CXM7ItS/+9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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