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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd45533ea60360e6985d7440c0c9244bb79ba696dc59f4357aa97c06b31e4bc' 
  AND token = 'e9wBqT2Dvv8XtNJnrIp2LUIi5wUH7GRaF9YQ68alru0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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