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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83fa4ad57befeb809e7e5d565daef75370a10e69fa9e99e2f59da52ed437b13c' 
  AND token = '3+9+fSAo3M2+qOTxvyDrIk/lq8iX3QnWg1wouJOFGlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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