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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6085949336a1d09e0c85d95a276c8b31502ad5b042e7bab447919be17cb33f3' 
  AND token = 'UNCVorIuWk6woKCmbdf2MvSNSObm1GIadve8LdNzyJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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