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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af99d781269b6ecedab35f27f5f5e4ec58ef7cbff3b70f9ea203be374562c0c9' 
  AND token = '5LNW/rojWIKjDVawOcxUN9U1ojwoOW2I3jF+42JsSpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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