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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf75301199e64b729e9b53613a6a799903c5e22b643c947565bf8cd785586cc2' 
  AND token = 't2mE2os7zvJTaHPu5vhPVulBbNcm9tv7nBEwTKhsI7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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