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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c64df390346cc9922a33e0360771aaf0e58b9aca9179ea7eb96c965de058174c' 
  AND token = 'r3MvwrTTk5kAIZAyBRgQ2wFhgie+2U3I6XZ2BvPsNJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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