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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '764aeff86f5f7afcc775e330dc2de0f9c979476d6faad52f51c9d86959163ef8' 
  AND token = '31Bvf/WrTFPnfkHDy8bAUFHb+3mZ67+g6c6hg6g3k5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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