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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5cdec553cb688e89eb67e6526cf7692a2de8fb8eef1668d36353207098ebf79' 
  AND token = 'XjqO3PB60KAhmSyAY5/zoUS0Ov+vDLzyYugK0eAQ6bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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