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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '289406ac16650d6508a069053c229f2c7d87739f7086833aa25339104639816d' 
  AND token = 'iAhgTQa13vZhYP6myW17fgaheZO2XdLUsF0Zc60lXpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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