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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4637b4e738291c35fcf66e304203c5a964ec5dbfc43ccd91dbcc0e12235db67' 
  AND token = 'fWKAScM66jTf0chRbaZv8vqTRh+evv9h1KQT8ZpMwaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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