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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f84889c0aec7490408eb225e89ff378e245059a9ead1e8f0d31be52ea41cd33e' 
  AND token = 'yhJAkLQQdHvaD4dSb8zJwJK4j+yjlz49AImvUclhDAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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