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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8964acb4c78db9d4d94f462d72e32fa32d9ab3226636e4ca119e782480d963b2' 
  AND token = 'Q+a4dhnI2JJXa7NF+VMpO0TWBgrJDx4wq/LXbmXcKhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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