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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3677c1a9699ed3bd1a967f8a2a6978fb2d956c53cc2afba4671186e0a396d6ae' 
  AND token = '55Bh/3sWHi8z5dBKm4qB7Nv2he9FhvHDK3+Hdvvou98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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