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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af8bc4881a6c38e9737513d2322613f608dc517cadd02d4137367c6d9e5b8ebb' 
  AND token = 'tQi3d+lR18GZq8ZP19a7M20PKnPeOlckxQXyCMQh5eE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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