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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984a54101daeaaf225aba02103a004e90ecd5d985711088351c3200679dc78e2' 
  AND token = 'PEMuQ68PeLMZ9DPip/CyjpdkLhta6lK1tC3FwNGvuwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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