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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da727dfb70ee3c9c3b1ac42f1f64e71d3b38acfe66dc1c88b29f9d6275f3c8fb' 
  AND token = 'FJiDLHuAYwOXoO/9gk1eTzYcDdgieNp5wL+Bjf7wAhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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