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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0dd29dc22b7347a0b7efba4d5e5d761188f83503be20b90ce3bb55d2a5417e' 
  AND token = 'elDO4VXLUg4s5mv72wE1czZm7QX/Fq45ispYZXF4sso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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