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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35e0468f3ee07976a67d6ff93916effbf62039c7691794e82d351d18917e2300' 
  AND token = 'cwzol0GtQEHIUDq4fAvjU3XHPmiOToc9e2IZdXrdbo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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