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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928471f9260ccc4683f6ca9135688196e6fd58646699c8cf6f2862c83fc6abbc' 
  AND token = 'bqJd+lK/g+TOB87T1OA26rKr4ICYI04DSDQsHEXc+fU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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