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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c60f091172a890ab04da3ab7fe41cf4241686daf2d9bbc293ed49318e48d01cd' 
  AND token = '9e9UvJGzprDn2dbOGJ4wXoTyaY3nEKvGKhmlo/B77U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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