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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d7a81fd73035ddd4caa573c22897fab416c86d39e14fc9f51358a11c987d68' 
  AND token = 'h6cuvx+QCmwICMVkVw4OfQHm73jKsw1TO9X6J1hFhwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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