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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58288a84002f2b8cb69cbdd3a110bd6606a0047806cd2961da8d9ae84f6456ff' 
  AND token = 'Hcryk/pBbdXHysbzNMa3O0G8i+MuZFQK9uZRgMH7vjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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