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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c701b36c3f3fdd108d8ecbc97cbbab8d114c1903424b2dbe803b455b3a2347bc' 
  AND token = 'r9x09OqMfn4YaYDO283zwHvgugEeyOVlF1DVQn1YYMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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