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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b596034fb417dd2e4cd6a236d648d343dc97f3d7895ab83480c94d9f6c591725' 
  AND token = 'jck8XMhVUAif2YM+v63t9TTG0EBea35+W9NFiQ8C7+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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