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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63260de441a7faa67030783a4ad02dc9d4e805d68885c57b48da073fac8f5dcc' 
  AND token = 'xCJOnD2EJ+h+6cVty5QYQ2DujZvNmYoqMClY5JvtCnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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