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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c0ae88607eb993233f61d522181f9ca0dbb2d042e0e6c4f7268b597b8a43a62' 
  AND token = 'q0ySd7GyK23HykHeitIjZVNabld6EY4Qs6FWMg2bPu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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