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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e968992882f554c49823fdc52ad76275058fc93dcb656889f6dacf2e9528fe' 
  AND token = '8OrpgjV5BPa7J9G/No0DCzmSuG65UytVAOqKT5v+tcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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