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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78b8cbc6fff434a654e8398a23793042d0c48ded382cb901d97cc66c3c33dfef' 
  AND token = 'HJlh7O7uo3jZN44nzpEP7Vs6bYc8mpPFdX11O/063Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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