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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0a31eef258ab1b56ec8f97686d29b30890e012acd5367e3acc4816fed9afd98' 
  AND token = 'YHa0cwdCf3GD/MEsjrQEbnNluzWj6c+AecOvD0qv670=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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