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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c1322080fdd9b1a3a0656690aa2f3b1bcfd211fb39997f0fc9bfe38bb6109c7' 
  AND token = 'C6hxVjoHQUFlen2OWV1uTeaNMuZAxccHjZDsSbFhFz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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